After installing a new version of an app today, I received the following error message after rebooting:

werfault.exe Application Error on boot after uninstall
The instruction at 0x000007FEFA1AC508 referenced memory at 0x000007FEFA1AC508. The required data was not placed into memory because of an I/O error status of 0xc0000065. Click OK to terminate the program.

After clicking oK, screen alternates between ~15 secs. of the usual Windows 7 Pro "Please Wait" screen and ~15 secs of a black screen with only a movable mouse pointer.

A spontaneous reboot occurred next.

Startup Repair did not work.

No System Restore points: had to turn them off due to lack of space on the HDD.

After rebooting, unable to login

Still get previous message.

Turned off computer for an hour.

Able to login this time.

Uninstalled the app...

Rebooted

Got same error message as before:
werfault.exe Application Erorr on boot after uninstall of Copernic 3.7
The instruction at 0x000007FEFA1AC508 referenced memory at 0x000007FEFA1AC508. The required data was not placed into memory because of an I/O error status of 0xc0000065. Click OK to terminate the program.

Click on OK

Now get this error message afterwards:

winlogon.exe bad image
C:\Windows\system32\UXINIT.DLL is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor.

After clicking OK, able to login

I get a black screen that looks like a new install!

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Based on the above, using my laptop I made the following searches here on EE:

If Windows 7 gets the boot sequence confused, it will go to a black screen and run a repair. That has happened to me and to a client machine. In both cases, the computer eventually restarted and worked. The repair took the best part of two hours.

At the last step above (black screen looks like a new install), did you let it proceed or cancel it/

With respect to memory and hard drive, you can get Ultimate Book CD, boot with it and run memtest.exe to check memory and run your hard drive manufacturer's hard drive test to check the hard drive.

The HDD test on UBCD didn't work and I couldn't figure out how to run WDC's DLGDIAGS DOS version. When I booted into Windows this morning, it booted just fine! So strange, but I guess it's intermittent...

So I installed then ran Western Digital DLGDIAG for Windows. It failed:

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